3.1.1 Beam Energies

The beam energies are spread from 1 GeV to 1 TeV (1000-1000000 MeV) Their values can be found here: PionBeamEnergies.txt

However, the single beam energy values are not concentrated in single files, but were randomly generated one after the other, thus every file contains every possible beam energy. Here the deposited energy (from the CalibHits , y-Axis) is plotted against the beam energy (Variable spcl_sume, x-Axis). This was done for negative (red) as well as for positive pions (blue).


Fig 1.: AllCluster _SumTotalEnergy plotted against the beam energy (for minus=red and plus=blue), no major differences visible

As a check, the number of events per beam energy was plotted in a chain, which tested the weights for different beam energies. The loop was supposed to lopp over all events, but stopped after 452200 events with the message

Event 452000
ientry < 0, breaking
WHY? As the number of max. events is set to 3000000, this is roughly only one sixth of the total number of entries of the entire chain.... Bug in TChain/Root??

# Number of events to be processed (default is 10)
theApp.EvtMax = 3000000

However, here is the plott of the beam energies, they are logarithmically distributed and each beam energy contains an equal amount of entries.


Fig 2.: Nevents per Beam energy

3.1.2 Eta und Phi characteristics of Single Pion Files

The files were generated with Pions uniformly distributed in eta:

EtaGen0.jpg Fig 3: Eta of the generated Pions - uniform distribution

EtaGenall.jpg Fig 4: Eta of ALL generated particles

PhiGen0.jpg PhiGenall.jpg

3.1.3 Number of clusters


Fig. 7: Number of clusters per event (consistent with what has been seen in the ApplyWeights macro)

3.1.4 Cellnoise


Fig 8: Level of noise (units - MeV)

3.1.5 Energy of the Cluster vs. eta of the cluster (COG)


EnergyCluster_EtaCluster_3D.jpg(here the z-axis is the number of entries)

Get Eta of the Cluster_COG:
-TMath::Log(TMath::Tan((TMath::ACos(cl_center_z_topo/TMath::Sqrt(cl_center_z_topo*cl_center_z_topo + cl_center_x_topo*cl_center_x_topo + cl_center_y_topo*cl_center_y_topo))/2))))

Scalarproduct a*b = |a| |b| cos (a,b) to get theta with b being the z-axis vector (0,0,1)
(cl_center_z_topo/TMath::Sqrt(cl_center_z_topo*cl_center_z_topo + cl_center_x_topo*cl_center_x_topo + cl_center_y_topo*cl_center_y_topo)

cl_e_topo is the variable for the cluster energy.

-- Main.kristin - 05 Jan 2007

Topic attachments
I Attachment History Action Size Date Who Comment
JPEGjpg AllClusterTotalSum_EtaGen0.jpg r1 manage 61.5 K 2007-01-11 - 15:59 UnknownUser  
JPEGjpg AllClusterTotalSum_EtaGen_all.jpg r1 manage 45.9 K 2007-01-11 - 15:58 UnknownUser  
JPEGjpg Edeposit_Ebeam_minus.jpg r1 manage 22.7 K 2007-01-05 - 20:15 UnknownUser Deposited energy against Beam Energy (negative Pions)
JPEGjpg Edeposit_Ebeam_plus.jpg r1 manage 22.2 K 2007-01-05 - 20:16 UnknownUser Deposited energy against Beam Energy (positive Pions)
JPEGjpg EnergyCluster_EtaCluster.jpg r1 manage 24.5 K 2007-01-14 - 18:40 UnknownUser  
JPEGjpg EnergyCluster_EtaCluster_3D.jpg r1 manage 43.3 K 2007-01-14 - 18:41 UnknownUser  
JPEGjpg EtaGen0.jpg r1 manage 16.1 K 2007-01-11 - 15:56 UnknownUser  
JPEGjpg EtaGenall.jpg r1 manage 16.2 K 2007-01-11 - 15:56 UnknownUser  
JPEGjpg PhiGen0.jpg r1 manage 16.3 K 2007-01-11 - 15:57 UnknownUser  
JPEGjpg PhiGenall.jpg r1 manage 16.6 K 2007-01-11 - 15:58 UnknownUser  
Texttxt PionBeamEnergies.txt r1 manage 0.8 K 2007-01-05 - 20:13 UnknownUser Text Files with beam energies
JPEGjpg can_BE.jpg r1 manage 51.8 K 2007-01-07 - 20:06 UnknownUser  
JPEGjpg cellnoise.jpg r1 manage 16.3 K 2007-01-11 - 15:55 UnknownUser  
JPEGjpg cl_nctotal_topo.jpg r1 manage 16.8 K 2007-01-11 - 15:56 UnknownUser  
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